Traps with vacuum breaker



y 1957 J. D. LANGDON 2,800,139

TRAPS WITH VACUUM BREAKER Filed May 4, 1954 FIG. 3

INVENTOR I Www TRAPS WITH VACUUM BREAKER Jesse D Langdon, Long Beach, Calif.

Ap ation May .95 ,.S 1'ia 427,507

3 Claims. (Cl. 137*2161) The instant invention relates to traps tor containment of a l q s al interrup in a dr in P pe e ween a i um ing fixture such as lavatory sink or other fixture in the e at o y.

h prima y p rpo e. of. th presen in enti n is to. prevent contamination of atmosphere. sewer gas due to siphoning of the liquid seal from a trap. interrupting s r con ected. ra n p p au e y a i pr sure existing in the sewer connected drain pipe; by providing apractical bacloflow preventing valve together with a vent communicating between, the sewer pipe and atmosphere at suoh times as. negative pressure exists within ai e e p pe.

n bjec of he inventi n is to devise a. drain ap construction including check valve elements; intervening een. n nlet end and ou et pa s terminus gether with a valved air inlet for communication with atmosphere, and devise automatic mechanical actuating means permitting independent or cooperative mechanical movement oi valve elements according to relative pressure conditions existing within and without said trap.

Other and: further objects and purposes will appear during progress of the specification, illustrated by the drawing Reduction to. practice depicted by the drawing is diagrammatic and used, for purpose of illustration only and may be changed within the scope of the claims.

f the drawing: I r

Fig. 1 is a vertical median sectional elevation of the invention intersecting all the elements comprising the construction of the invention.

Fig. 2 is a transverse sectional plan view looking down; taken at 2-2 Fig. 1.

Fig. 3 is a transverse sectional plan view looking down, showing an alternative species form of the device taken at the same plane as Fig. 2, wherein valve 3L is elongated transversely with relation to the width of valve portion 58.

Fig. 4 is a vertical median sectional elevation of a fragment of the device viewed from the same direction as Fig. 1, illustrating an alternative form 3V5C of valve members 3V and 5 depicted by Fig. 1.

The following is a brief summary and description generic to all figures of the drawing showing a siphonless trap comprising a casing having an inlet 1 and outlet 2 provided with respective upstanding inlet and outlet passage legs intercomrnunicating via a liquid seal well 4 located below the terminal ends of said inlet 1 and said outlet 2, the outlet leg interrupted by an outlet valve member 5, Figs. 1 and 2, 58, Fig. 3, or 5C, Fig. 4, disposed substantially transversely of and normally closing the upstanding outlet passage, a downwardly directed passage 3 forming a vent communicating between atmosphere and the terminus of said outlet 2 above the outlet valve member, 5, 55 or 5C, the vent passage 3 interrupted by a vent valve member 3V, Figs. 1, 2 and 4, or 3L, Fig. 3, same being of greater area than the outlet valve member 5, 58 or 50; concomitant both valves nited States Patent. 0

ice

arranged to. overlap the vent 3 and upstanding leg 4 of outlet 2 including vent valve 3V or 3L and outlet valve 5, 3 or 5C; the extension or lever 5E, Figs. 1, 2 and 3, or 5A.-5D, Fig. 4, conjoined with both valves at their conjunction between outlet 2 and air vent 3 and secured in operative position by a pivot pin 6v forming hinge means permitting said extension or lever to rock to and fro according to prevailing conditions of pressure effective against the valve mechanism, whereby liquid flowing from said inlet. 1 to said outlet 2 will urge said outlet valve. 5, 58 or SC to open position and said extension means SE against said. vent valve av -6L ur ng same to its. seat; a reverse liquid flow entering said. outl t. 2. eifective to close both valves against liquid egress said inlet 1 and said vent passage 3, negative pressure; existing in said outlet and the passage above said outlet valve, atmospheric pressure. against the underside of said vent valve of greater area than said outlet valve effective to overcome atmospheric pressure effect beneath said outlet valve and hold same in closed. position.

Fig- 2 sh w th e nsion SE of F g 2 nd 3 as being formed with two divergent prongs instead oi one as appears. in Figs. 1 and 4 adapted to afford more sup- .port against and to urge the vent; valve 3V or 3L to its seat when'outlet valve 5- 5S or 50 is opened by liquid pressure.

Negative pressure existing within outlet end 2, at,- mosp'heric pressure effective against the greater area pre sented. by the underside of valve 3V urges same: against; and impinges outlet valve extension 5E holding valve 5 to its seat across upstanding portion of outlet leg 4 prer venting egress and los-s of liquid Seal from well 4 into,- sewer drain pipe via outlet 2. Baffle 4B is provided in well; passage 4;. and has a free edge projecting toward. inlet. legl, liquid. passage from the inlet toward the outlet is impededand substances heavier than passing liquid are caught beneath the bafile and separated from the liquid. v .Baflle 4B may be perforated to facilitate liquid movement.

When the sewer line intercepted by the described trap is plugged below the lowermost fixture of several inalled ne above ie other a inmu p e storied build; ings, liquid backed up in an intercommunicating drain pipe is effective against valves 3V and 5 to close the trap against liquid egress, preventing lower floors flooding.

The species of Fig. 3 depicts an elongated air inlet valve 3L which may be of smaller area than the outlet valve 5 provided extension means SE is short enough and valve member BL is elongated to provide leverage to counteract atmospheric pressure elTec-t on valve 58, as the length of valve member 58 lies transversely of the length of valve member 3L, that end of valve 3L that is distal from valve 58 transmitting added leverage via extension means SE in proportion to length .of lever formed by valve 3L overcoming shorter leverage exerted by comparatively short lever formed by the width of valve 55, pivot 6 being fulcrum point for both levers, the valve 3L open impinging extension SE of valve 58 thus compounding leverage a-gainst valve 58 urging same to its seat with force in proportion to leverage ratio of each valve. Greater leverage of valve member 31. overcoming relatively short leverage of valve 55. It is obvious valve members 3L and 58 may have separate hinges if desired.

Construction illustrated by Fig. 3 functions as follows: Liquid entering thru inlet 1 passing thru the upstanding passage leg portion thru outlet 2 raises valve 58 causing extension SE to impinge and urge valve 3L to its seat closing inlet 3. When fluid pressure emanates thru outlet 2 both valves are urged to closed position.

Fig. 4 depicts both valves 3V and 50 as being formed of: one continuous piece of flexible material held in place by and adapted to flex and bend at a point below hinge pin 6 where the extension 5A is hinged in conjunction with the outlet valve 5C this alternative construction meets structural and functional requirements generically described supra: the extension 5A'5D in conjunction with said outlet valve 5C rocking to and fro according to the condition of pressure effective against said outlet valve 5C.

Viewed from the direction as Figs. 1 and 4 the outlet valve 5, Fig. 1, 5C Fig. 4, and the extension 5E, 5A-5D of Fig. 4 joining one another in a unit with valve 30 have the appearance, shape and effect of a bell lever, one arm of the lever being constituted by the valve 5, the opposite arm formed by said extension means SE both arms being conjoined and hinged concomitant the vent valve, 3V or 3L by hinge means 6, the arm formed by said extension means SE, Figs. 1, 2 and 3, 4A-4D, Fig. 4, being disposed at an angle divergent upward from outlet valve 5 and overlapping above the vent valve 3V whereby said extension 5E, or 5A5D will impinge said valve 3V when said outlet valve 5, Fig. 1, 58, Fig. 3, or 5C, Fig. 4, is in open position.

Having described the invention and functions thereof, the following claims are made:

1. A siphonless trap comprising a casing having upstanding inlet and outlet legs communicating with a liquid seal well, the outlet leg interrupted by a valve member disposed substantially transversely of an upstanding portion of said outlet passage and being norm-ally closed of its own weight, an air vent communieating with said outlet end above said valve member, a second valve member of greater area than first named valve normally standing substantially transversely of and closing said air vent by gravity, extension means having urged to respective seats closing the passageway between the inlet and the outlet of said trap under effects of liquid pressure greater than atmospheric emanating from the outlet of said trap.

2. A siphonless trap combination including inlet and outlet passage legs communicating thru a well provided to contain a liquid seal for interrupting a sewer connected drain pipe from a plumbing fixture; comprising upstanding inlet and outlet passage legs, gravity actuated valve means interrupting and normally closing the upstanding leg of the outlet, an air vent communicating between atmosphere and said outlet above the valve means closing the outlet passage; a second gravity actuated valve means closing said air vent, the first and second named valve means pivotally mounted and hinged adjoining one another, the first named valve means having a portion extended toward the hinged end, diverging from the upper face of the second named valve means above the hinged portion and providing a stop to limit opening of the second named valve, whereby liquid under pressure passing from the inlet toward and opening the outlet valve will cause the extended portion of the first named valve to impinge the body ofthe second named valve and hold same in closed position to prevent liquid egress thru said air vent.

3. A species of device of the genus defined by claim 1 wherein both valves are in the form of a continuous member made of flexible material pivotally conjoined with an extension formed by a lever of rigid material hingedly secured at the conjunction of the two valves, the hinge being located between the air vent and upstanding leg of the outlet, the lever adapted to rock between the two valves. 7

References Cited in the file of this patent UNITED STATES PATENTS 838,001- Bonnell et al Dec. 11, 1906 2,277,295 Brown Mar. 24, 1942 2,449,573 White Sept. 21, 1948 2,630,874 Langdon Mar. 10, 1953 FOREIGN PATENTS 884 Australia Mar. 8, 1926 

